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PDF LTM4630 Data sheet ( Hoja de datos )
| Número de pieza | LTM4630 | |
| Descripción | Dual 18A or Single 36A DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4630
Dual 18A or Single 36A
DC/DC µModule Regulator
FEATURES
n Dual 18A or Single 36A Output
n Wide Input Voltage Range: 4.5V to 15V
n Output Voltage Range: 0.6V to 1.8V
n ±1.5% Maximum Total DC Output Error Over Line,
Load and Temperature
n Differential Remote Sense Amplifier
n Current Mode Control/Fast Transient Response
n Adjustable Switching Frequency
n Overcurrent Foldback Protection
n Multiphase Parallel Current Sharing with Multiple
LTM4630s Up to 144A
n Frequency Synchronization
n Internal Temperature Monitor
n Pin Compatible with the LTM4620 and LTM4620A (Dual
13A, Single 26A) and LTM4628 (Dual 8A, Single 16A)
n Selectable Burst Mode® Operation
n Soft-Start/Voltage Tracking
n Output Overvoltage Protection
n 16mm × 16mm × 4.41mm LGA and 16mm × 16mm ×
5.01mm BGA Packages
APPLICATIONS
n Telecom and Networking Equipment
n Storage and ATCA Cards
n Industrial Equipment
DESCRIPTION
The LTM®4630 is a dual 18A or single 36A output switching
mode step-down DC/DC µModule® (micromodule) regula-
tor. Included in the package are the switching controllers,
power FETs, inductors, and all supporting components.
Operating from an input voltage range of 4.5V to 15V, the
LTM4630 supports two outputs each with an output voltage
range of 0.6V to 1.8V, each set by a single external resistor.
Its high efficiency design delivers up to 18A continuous
current for each output. Only a few input and output ca-
pacitors are needed. The LTM4630 is pin compatible with
the LTM4620 and LTM4620A (dual 13A, single 26A) and
the LTM4628 (dual 8A, single 16A).
The device supports frequency synchronization, multi-
phase operation, Burst Mode operation and output voltage
tracking for supply rail sequencing and has an onboard
temperature diode for device temperature monitoring. High
switching frequency and a current mode architecture enable
a very fast transient response to line and load changes
without sacrificing stability.
Fault protection features include overvoltage and
overcurrent protection. The LTM4630 is offered in 16mm
× 16mm × 4.41mm LGA and 16mm × 16mm × 5.01mm
BGA packages. The LTM4630 is ROHS compliant.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620,
6100678, 6144194, 6177787, 6304066 and 6580258. Other patents pending.
TYPICAL APPLICATION
36A, 1.2V Output DC/DC µModule Regulator
INTVCC
4.7µF
10k
VIN
4.5V TO 15V
10k
22µF
25V 120k
×4
5.1V
0.1µF
121k
MODE_PLLIN
VIN
TEMP
RUN1
RUN2
TRACK1
TRACK2
fSET
PHASMD
CLKOUT INTVCC
LTM4630
SGND GND
DIFFP
EXTVCC PGOOD1
VOUT1
VOUTS1
DIFFOUT
SW1
VFB1
VFB2
COMP1
COMP2
VOUTS2
VOUT2
SW2
PGOOD2
DIFFN
PGOOD
100µF +
6.3V
60.4k
100µF +
6.3V
PGOOD
470µF
6.3V
470µF
6.3V
VOUT
1.2V
36A
4630 TA01a
For more information www.linear.com/LTM4630
1.2VOUT Efficiency vs IOUT
95
VIN = 5V
90
85 VIN = 12V
80
75
70
65
0 2 4 6 8 10 12 14 16 18
OUTPUT CURRENT (A)
4630 TA01b
4630fa
1
1 page  
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTM4630 is tested under pulsed load conditions such that
TJ ≈ TA. The LTM4630E is guaranteed to meet specifications from
0°C to 125°C internal temperature. Specifications over the –40°C to
125°C internal operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM4630I is guaranteed over the full –40°C to 125°C internal operating
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
LTM4630
Note 3: Two outputs are tested separately and the same testing condition
is applied to each output.
Note 4: The switching frequency is programmable from 400kHz to 750kHz.
Note 5: LTM4630 device is designed to operate from 400kHz to 750kHz
Note 6: These parameters are tested at wafer sort.
Note 7: See output current derating curves for different VIN, VOUT and TA.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current,
VIN = 5V, fS = 450kHz
100
Efficiency vs Output Current,
VIN = 12V, fS = 450kHz
95
Dual Phase Single Output Efficiency
vs
fS
Output Current,
= 450kHz
VIN
=
12V,
95
95 90 90
90
85
80
VOUT = 1V
VOUT = 1.2V
VOUT = 1.5V
75 VOUT = 1.8V
0 2 4 6 8 10 12 14 16 18
LOAD CURRENT (A)
4630 G01
85
80
75
VOUT = 1V
70
VOUT = 1.2V
VOUT = 1.5V
VOUT = 1.8V
65
0 2 4 6 8 10 12 14 16 18
LOAD CURRENT (A)
4630 G02
85
80
75
VOUT = 1V
70 VOUT = 1.2V
VOUT = 1.5V
65 VOUT = 1.8V
0 5 10 15 20 25 30 35 40
LOAD CURRENT (A)
4630 G03
Burst Mode and Pulse-Skip Mode
fESff=ici4e5n0ckyHVzIN=12V, VOUT = 1.2V,
100 CCM
90
Burst Mode OPERATION
PULSE-SKIP MODE
80
70
1V Single Phase Output Load
Transient Response
VOUT(AC)
50mV/Div
1.2V Single Phase Output Load
Transient Response
VOUT(AC)
50mV/Div
60
50
40
30
0.01
0.1 1 10
LOAD CURRENT (A)
4630 G04
LOAD STEP
2A/DIV
20µs/DIV
4630 G05
12VIN, 1VOUT, 450kHz, 4.5A LOAD STEP,
4.5A/µs STEP-UP AND STEP-DOWN
COUT = 1 • 470µF 4V POSCAP + 1 • 100µF
6.3V CERAMIC
LOAD STEP
2A/DIV
20µs/DIV
4630 G06
12VIN, 1.2VOUT, 450kHz, 4.5A LOAD STEP,
4.5A/µs STEP-UP AND STEP-DOWN
COUT = 1 • 470µF 4V POSCAP + 1 • 100µF
6.3V CERAMIC
For more information www.linear.com/LTM4630
4630fa
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5 Page 
LTM4630
APPLICATIONS INFORMATION
The typical LTM4630 application circuit is shown in Fig-
ure 23. External component selection is primarily deter-
mined by the maximum load current and output voltage.
Refer to Table 4 for specific external capacitor requirements
for particular applications.
VIN to VOUT Step-Down Ratios
There are restrictions in the maximum VIN and VOUT step-
down ratio that can be achieved for a given input voltage.
Each output of the LTM4630 is capable of 98% duty cycle,
but the VIN to VOUT minimum dropout is still shown as a
function of its load current and will limit output current
capability related to high duty cycle on the top side switch.
Minimum on-time tON(MIN) is another consideration in
operating at a specified duty cycle while operating at a
certain frequency due to the fact that tON(MIN) < D/fSW,
where D is duty cycle and fSW is the switching frequency.
tON(MIN) is specified in the electrical parameters as 90ns.
Output Voltage Programming
The PWM controller has an internal 0.6V reference voltage.
As shown in the Block Diagram, a 60.4kΩ internal feedback
resistor connects between the VOUTS1 to VFB1 and VOUTS2
to VFB2. It is very important that these pins be connected
to their respective outputs for proper feedback regulation.
Overvoltage can occur if these VOUTS1 and VOUTS2 pins are
left floating when used as individual regulators, or at least
one of them is used in paralleled regulators. The output
voltage will default to 0.6V with no feedback resistor on
either VFB1 or VFB2. Adding a resistor RFB from VFB pin to
GND programs the output voltage:
VOUT
=
0.6V
•
60.4k +RFB
RFB
Table 1. VFB Resistor Table vs Various Output Voltages
VOUT 0.6V 1.0V 1.2V 1.5V
RFB Open 90.9k 60.4k 40.2k
1.8V
30.2k
For parallel operation of multiple channels the same feed-
back setting resistor can be used for the parallel design.
This is done by connecting the VOUTS1 to the output as
shown in Figure 2, thus tying one of the internal 60.4k
resistors to the output. All of the VFB pins tie together with
one programming resistor as shown in Figure 2.
In parallel operation, the VFB pins have an IFB current of 20nA
maximum each channel. To reduce output voltage error due
to this current, an additional VOUTS pin can be tied to VOUT,
and an additional RFB resistor can be used to lower the total
Thevenin equivalent resistance seen by this current. For
example in Figure 2, the total Thevenin equivalent resistance
of the VFB pin is (60.4k//RFB), which is 30.2k where RFB is
equal to 60.4k for a 1.2V output. Four phases connected
in parallel equates to a worse case feedback current of
4 • IFB = 80nA maximum. The voltage error is 80nA • 30.2k
= 2.4mV. If VOUTS2 is connected, as shown in Figure 2, to
VOUT, and another 60.4k resistor is connected from VFB2 to
ground, then the voltage error is reduced to 1.2mV. If the
voltage error is acceptable then no additional connections
are necessary. The onboard 60.4k resistor is 0.5% accurate
and the VFB resistor can be chosen by the user to be as
accurate as needed. All COMP pins are tied together for
current sharing between the phases. The TRACK/SS pins
can be tied together and a single soft-start capacitor can
be used to soft-start the regulator. The soft-start equation
will need to have the soft-start current parameter increased
by the number of paralleled channels. See Output Voltage
Tracking section.
COMP1 LTM4630
COMP2
60.4k
TRACK1
TRACK2
60.4k
VOUT1
VOUT2
VOUTS1
VOUTS2
VFB1
VFB2
0.1µF
COMP1 LTM4630
COMP2
60.4k
TRACK1
TRACK2
60.4k
VOUT1
VOUT2
VOUTS1
VOUTS2
VFB1
VFB2
4630 F02
4 PARALLELED OUTPUTS
FOR 1.2V AT 70A
OPTIONAL CONNECTION
OPTIONAL
RFB
60.4k
USE TO LOWER
TOTAL EQUIVALENT
RESISTANCE TO LOWER
IFB VOLTAGE ERROR
RFB
60.4k
Figure 2. 4-Phase Parallel Configurations
For more information www.linear.com/LTM4630
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4630.PDF ] | |
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